Conformational dynamics in crystals reveal the molecular bases for D76N beta-2 microglobulin aggregation propensity
Articolo
Data di Pubblicazione:
2018
Citazione:
Conformational dynamics in crystals reveal the molecular bases for D76N beta-2 microglobulin aggregation propensity / T. Le Marchand, M. de Rosa, N. Salvi, B.M. Sala, L.B. Andreas, E. Barbet-Massin, P. Sormanni, A. Barbiroli, R. Porcari, C. Sousa Mota, D. de Sanctis, M. Bolognesi, L. Emsley, V. Bellotti, M. Blackledge, C. Camilloni, G. Pintacuda, S. Ricagno. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 9:1(2018), pp. 1658.1-1658.11.
Abstract:
Spontaneous aggregation of folded and soluble native proteins in vivo is still a poorly understood process. A prototypic example is the D76N mutant of beta-2 microglobulin (β2m) that displays an aggressive aggregation propensity. Here we investigate the dynamics of β2m by X-ray crystallography, solid-state NMR, and molecular dynamics simulations to unveil the effects of the D76N mutation. Taken together, our data highlight the presence of minor disordered substates in crystalline β2m. The destabilization of the outer strands of D76N β2m accounts for the increased aggregation propensity. Furthermore, the computational modeling reveals a network of interactions with residue D76 as a keystone: this model allows predicting the stability of several point mutants. Overall, our study shows how the study of intrinsic dynamics in crystallo can provide crucial answers on protein stability and aggregation propensity. The comprehensive approach here presented may well be suited for the study of other folded amyloidogenic proteins.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
NMR chemical-shifts; proton-detected NMR; rational design; amyloid fibrils; protein; state; relaxation; model; assignment; backbone
Elenco autori:
T. Le Marchand, M. de Rosa, N. Salvi, B.M. Sala, L.B. Andreas, E. Barbet-Massin, P. Sormanni, A. Barbiroli, R. Porcari, C. Sousa Mota, D. de Sanctis, M. Bolognesi, L. Emsley, V. Bellotti, M. Blackledge, C. Camilloni, G. Pintacuda, S. Ricagno
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